Use the child's strongest time of day, not only the prettiest light
Adults often plan around scenery and photography, but with young children the day's success depends more on cooperation and emotional stability. Some children are happiest in the morning and fade later. Others are slow to start and only settle after rest. Understanding your child's pattern is usually more useful than copying a generic “best time to visit” rule.
Morning often suits sights with transfers, queues or a clearer walking sequence
If the attraction involves earlier entry, shuttle buses, queueing or a route that is easier to complete in one go, morning is often safer. The family can finish the main outing before lunch and then connect naturally into food, rest and a hotel break. That structure tends to reduce afternoon stress.
Afternoon can be better for children who need a slow start
Some families spend a lot of energy just getting ready in the morning. If dressing, breakfast and loading the stroller already create pressure, forcing the main attraction into the morning can make everyone tense. In that situation, using the morning for a calm start and putting the main sight after a nap may produce a much smoother day.
The main sight should not become the day's single rigid mission
The safest family itineraries still leave room to shorten or simplify. Whether the main sight is in the morning or afternoon, it helps to know where the toilets, meal stops, vehicle return point and hotel transition are. The real goal is not to guarantee perfection, but to make the day recoverable if the child's condition changes.